And heney bienn



BEVEL SQUARE.

Patented Aug. 9, 1881..

(No Model.)

M. WOESSNER 8: H. BIRNN.

Fig- 2,.

\\\\\\\\\\\ w A ///////V//////// WWW Nvuvvyw \-\vw-r INVENTORS BY -ewvlWW ATTORNEY HI'IIIIIIIIIIIIIJHIIHllllllll IIHIIIH'HIIIHILHIIHHIHIHlIII-IHHI 4o angle square.

UNIT D STATES PATENT @FEIQE.

MATTHEW WOESSNER, OF BROOKLYN, NEW YORK, AND HENRY EIENN, OF

JERSEY crrY, NEW JEnsEY.

BEVEL-SQUARE:

SPECIFICATION forming part of Letters Patent No. 245,596, datedAugust-9, 1881.

Application filed May 27, 1881.

To all whom it may concern Be it known that we, MATTHEW WOESSNER, aresident of Brooklyn, county of Kings, and State of New York, and HENRYBIRNN, a resident of Jersey City, county of Hudson, and State of NewJersey, have invented certain new and useful Improvements inBevel-Squares; and we do hereby declare that the following is a full,clear, and exact description thereof, reference beinghad to theaccompanying drawings, and to the letters of reference marked thereon,making a part of this specification.

This invention relates to an improvement in try-squares, whereby thesame instrument may I 5 serve equally well as a try-square and as abevel-square, capable of accurate adjustment to any desired angle.

It consists in so fitting a rectangular arm within a rectangular recesscut in the side of the tool-stock as that the arm shall completely fillout the recess and present a flush, even surface and form a perfectstraight edge for the tool on either side as well as at its ends; also,in pivoting and securing the inner end of said arm to the stock by meansof a semicir' cular offset or plate at said inner end fitting into acorrespondingslot or mortise cut in the stock, the offset being providedwith one or more semicircular projections fitting within counterpartgrooves in the slot.

The face of the semicircular plate is marked off with a scale ofdegrces,which, being visible through a small opening cutin the face of thestock, serves to indicate the angle which the arm forms with the stock,from one degree to ninety degrees.

In the accompanying drawings Figure l is a plan view of ourimprovedbevel-square with its pivoted arm swung open to form a right- Fig. 2 isa longitudinal section in line aw, and Fig. 3 a transverse section inline y y, of Fig. 1; and Fig. 4 is a plan view of the blade or armdetached.

A is the stock or body of the square, having a longitudinal rectangularrecess, D, cut away on one side thereof, parallel to the side of thestock, and at a right angle to its end. The outer side of the stock andthe inner side of the recess D are marked off with a scale for ordinaryuse.

Bis an arm of the same thickness as the the offset 0, to receive thesame.

(No model.)

stock A, and of dimensions to exactly fill the recess D, so that whenlaid or closed therein its outer edge and end will come flush and form aperfectly straight edge with the side and end 5 of the stock. (Seedotted line, Fig. l.)

The inner end of the arm B is provided with an offset, 0, a portion ofwhich projects at right angles, and whose outer edge, forming the end ofthe arm, is furnished with a semicircular 6o curve, as shown in Fig. 4.The thickness of this offset is less than that of the stock A, and aslot is cut centrally through in the thickness of the stock A, at theinner angle of the recess D, conforming in dimensions and shape with Oneor more semicircular ridges, a a, Figs. 2, 3, and 4, are formed upon theface of the offset 0 of the arm, and counterpart grooves are formed inthe slot in the stock A, so that when the one is fitted .70 into theother a hinged joint is thereby formed, which permits the arm to turn inthe slot, but prevents its withdrawal therefrom.

To permit theintroduction of the end of the arm into the slot the stockA is formed in two divisions, S. S, (see Fig. 2,) which are rivetedtogether after the arm has been placed in position.

The ridge a in the offset 0 of the arm is laid off and marked with ascale of degrees, (see Fig. 4,) and an aperture, 0', is cut in the faceof the stock, through which the graduated arc is visible, whereby theangle of the arm B with the stock is constantly indicated to the eye.The continuity of the inner edge of the arm B, in full width, ismaintained to its intersection with the inner edge of the stock A bymeans ofa shoulder,f, formed upon both sides thereof along the edge ofthe offset 0 to its inner angle. (See Figs. 1 and 4.)

The instrument thus constructed presents no outer curved or irregularedges when opened or closed; but its edges are true and straight in allpositions, and it is equally well adapted for a straight-edge rule oratry or bevel square. 5 The arm facilitates the laying out or measuringof any angle up to ninety degrees, the angle being readily read off uponthe graduated are. 1

Instead of securing the joint between the I00 arm and stock by means ofa ridge or projection upon the offset 0 fitting into counterpart groovesin the slot in the stock, which necessitates a division of the stock topermit of the introduction of the offset into the slot, the offset maybe adapted to slip into the slot and be secured by means of a transversepin passing through a curved slot in the offset.

What we claim as new, and desire to secure by Letters Patent, is

1. A stock, A, having a rectangular recess upon one side thereof, andprovided with an arm, B, pivoted to the stock by means of an offsetfitting and working in a semicircular slot cut in the stock at rightangles to said recess, substantially asand for the purpose herein setforth.

2. The two plates in the divided stock A,

provided with semicircular grooves in a recess

